import axios, { AxiosInstance, AxiosError, AxiosRequestConfig, InternalAxiosRequestConfig, AxiosResponse } from 'axios';
import { showFullScreenLoading, tryHideFullScreenLoading } from '@/config/serviceLoading';
import { LOGIN_URL } from '@/config';
import { ElMessage } from 'element-plus';
import { ResultData } from '@/api/interface';
import { ResultEnum } from '@/enums/httpEnum';
import { checkStatus } from '@/api/helper/checkStatus';
import { useUserStore } from '@/store/modules/user';
import router from '@/routers';

/**
 * @description 请求服务名称
 **/
export enum ServerEnum {
	BASE_SERVER = 'base_server',
	MUSIC_SERVER = 'music_server',
}

type ServerType = ServerEnum[keyof ServerEnum];

export interface CustomAxiosRequestConfig extends InternalAxiosRequestConfig {
	loading?: boolean;
	server_name?: ServerType;
}
export interface CustomRequestConfig extends AxiosRequestConfig {
	loading?: boolean;
	server_name?: ServerType;
}

const servers = [
	{
		name: ServerEnum.BASE_SERVER,
		url: import.meta.env.VITE_BASE_API as string,
	},
	{
		name: ServerEnum.MUSIC_SERVER,
		url: import.meta.env.VITE_MUSIC_API as string,
	},
];

const config = {
	// 默认地址请求地址，可在 .env.** 文件中修改
	// baseURL: import.meta.env.VITE_MUSIC_API as string,
	// 设置超时时间
	timeout: ResultEnum.TIMEOUT as number,
	// 跨域时候允许携带凭证
	withCredentials: true,
};

class RequestHttp {
	service: AxiosInstance;
	public constructor(config: AxiosRequestConfig) {
		this.service = axios.create(config); // instantiation
		/**
		 * @description 请求拦截器
		 * 客户端发送请求 -> [请求拦截器] -> 服务器
		 * token校验(JWT) : 接受服务器返回的 token,存储到 vuex/pinia/本地储存当中
		 */
		this.service.interceptors.request.use(
			(config: CustomAxiosRequestConfig) => {
				const { loading, server_name } = config;
				if (server_name) {
					const server = servers.find((item) => item.name === config.server_name);
					config.baseURL = server ? server.url : servers[0].url;
				} else {
					config.baseURL = servers[0].url;
				}
				const userStore = useUserStore();
				// 当前请求不需要显示 loading，在 api 服务中通过指定的第三个参数: { Loading: true } 来控制
				loading && showFullScreenLoading();
				if (config.headers && typeof config.headers.set === 'function') {
					config.headers.set('x-access-token', userStore.token);
				}
				return config;
			},
			(error: AxiosError) => {
				return Promise.reject(error);
			}
		);

		/**
		 * @description 响应拦截器
		 *  服务器换返回信息 -> [拦截统一处理] -> 客户端JS获取到信息
		 */
		this.service.interceptors.response.use(
			(response: AxiosResponse) => {
				const { data } = response;
				const userStore = useUserStore();
				tryHideFullScreenLoading();
				// 登陆失效
				if (data.code == ResultEnum.OVERDUE) {
					userStore.setToken('');
					router.replace(LOGIN_URL);
					ElMessage.error(data.msg);
					return Promise.reject(data);
				}
				// 全局错误信息拦截（防止下载文件的时候返回数据流，没有 code 直接报错）
				if (data.code && parseInt(data.code) !== ResultEnum.SUCCESS) {
					ElMessage.error(data.msg);
					return Promise.reject(data);
				}
				// 成功请求（在页面上除非特殊情况，否则不用处理失败逻辑）
				return data;
			},
			async (error: AxiosError) => {
				const { response } = error;
				tryHideFullScreenLoading();
				// 请求超时 && 网络错误单独判断，没有 response
				if (error.message.indexOf('timeout') !== -1) ElMessage.error('请求超时！请您稍后重试');
				if (error.message.indexOf('Network Error') !== -1) ElMessage.error('网络错误！请您稍后重试');
				// 根据服务器响应的错误状态码，做不同的处理
				if (response) checkStatus(response.status);
				// 服务器结果都没有返回(可能服务器错误可能客户端断网)，断网处理:可以跳转到断网页面
				if (!window.navigator.onLine) router.replace('/500');
				return Promise.reject(error);
			}
		);
	}

	/**
	 * @description 常用请求方法封装
	 */
	get<T>(url: string, params?: object, _object: CustomRequestConfig = {}): Promise<ResultData<T>> {
		return this.service.get(url, { params, ..._object });
	}
	post<T>(url: string, params?: object | string, _object: CustomRequestConfig = {}): Promise<ResultData<T>> {
		return this.service.post(url, params, _object);
	}
	put<T>(url: string, params?: object, _object: CustomRequestConfig = {}): Promise<ResultData<T>> {
		return this.service.put(url, params, _object);
	}
	delete<T>(url: string, params?: any, _object: CustomRequestConfig = {}): Promise<ResultData<T>> {
		return this.service.delete(url, { params, ..._object });
	}
	download(url: string, params?: object, _object: CustomRequestConfig = {}): Promise<BlobPart> {
		return this.service.post(url, params, { ..._object, responseType: 'blob' });
	}
	request<T>(config: CustomRequestConfig): Promise<T> {
		return this.service(config);
	}
}

export default new RequestHttp(config);
